<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .big {
            width: 100vw;
            height: 500px;
            background-color: #f0f0f0;
            display: flex;
        }
        .left {
            width: 200px;
            background-color: #56a5f1;
        }
        .right {
            background-color: pink;
            flex: 1;
        }
        .main {
            display: flex;
            justify-content: center;
        }
        .main div {
            width: 100px;
            height: 400px;
            border: 2px solid goldenrod;
            border-radius: 6px;
            margin: 0 10px;;
        }
    </style>
</head>
<body>
    <!-- 左定右不定布局 -->
    <!-- 左定右定中间变化的布局？？？？ -->
    <div class="big">
        <div class="left"></div>
        <div class="right">
            <!-- 在主体内容区域进一步三等分 -->
            <div class="main">
                <div class="play1">play1</div>
                <div class="play2">play2</div>
                <div class="play3">play3</div>
            </div>
        </div>
    </div>
</body>
</html>